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Title: From Ξ → Λπ to Ξ → Λπ

Abstract

Using a successful framework for describing S-wave hadronic decays of light hyperons induced by a subprocess s -> u((u) over bard), we presented recently a model-independent calculation of the amplitude and branching ratio for Xi(-)(b) -> Lambda(b)pi(-) in agreement with a LHCb measurement. The same quark process contributes to Xi(0)(c) -> Lambda(c)pi(-), while a second term from the subprocess cs -> cd has been related by Voloshin to differences among total decay rates of charmed baryons. We calculate this term and find it to have a magnitude approximately equal to the s -> u((u) over bard) term. We argue for a negligible relative phase between these two contributions, potentially due to final state interactions. However, we do not know whether they interfere destructively or constructively. For constructive interference one predicts B(Xi(0)(c) -> Lambda(c)pi(-)) = (1.94 +/- 0.70) x 10(-3) and B(Xi(+)(c) -> Lambda(c)pi(0)) = (3.86 +/- 1.35) x 10(-3). For destructive interference, the respective branching fractions are expected to be less than about 10(-4) and 2 x 10(-4). (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).

Authors:
;
Publication Date:
Research Org.:
Univ. of Chicago, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1246758
Alternate Identifier(s):
OSTI ID: 1280745
Grant/Contract Number:  
FG02-13ER41598
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 757 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; nonleptonic hyperon decay; heavy baryons; weak decays

Citation Formats

Gronau, Michael, and Rosner, Jonathan L. From Ξ → Λπ to Ξ → Λπ. Netherlands: N. p., 2016. Web. doi:10.1016/j.physletb.2016.04.020.
Gronau, Michael, & Rosner, Jonathan L. From Ξ → Λπ to Ξ → Λπ. Netherlands. doi:10.1016/j.physletb.2016.04.020.
Gronau, Michael, and Rosner, Jonathan L. Wed . "From Ξ → Λπ to Ξ → Λπ". Netherlands. doi:10.1016/j.physletb.2016.04.020.
@article{osti_1246758,
title = {From Ξ → Λπ to Ξ → Λπ},
author = {Gronau, Michael and Rosner, Jonathan L.},
abstractNote = {Using a successful framework for describing S-wave hadronic decays of light hyperons induced by a subprocess s -> u((u) over bard), we presented recently a model-independent calculation of the amplitude and branching ratio for Xi(-)(b) -> Lambda(b)pi(-) in agreement with a LHCb measurement. The same quark process contributes to Xi(0)(c) -> Lambda(c)pi(-), while a second term from the subprocess cs -> cd has been related by Voloshin to differences among total decay rates of charmed baryons. We calculate this term and find it to have a magnitude approximately equal to the s -> u((u) over bard) term. We argue for a negligible relative phase between these two contributions, potentially due to final state interactions. However, we do not know whether they interfere destructively or constructively. For constructive interference one predicts B(Xi(0)(c) -> Lambda(c)pi(-)) = (1.94 +/- 0.70) x 10(-3) and B(Xi(+)(c) -> Lambda(c)pi(0)) = (3.86 +/- 1.35) x 10(-3). For destructive interference, the respective branching fractions are expected to be less than about 10(-4) and 2 x 10(-4). (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).},
doi = {10.1016/j.physletb.2016.04.020},
journal = {Physics Letters B},
number = C,
volume = 757,
place = {Netherlands},
year = {2016},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2016.04.020

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